code: def testList(self):
      rt_checker = dispatch.MakeInstanceChecker(
          ragged_tensor.RaggedTensor
      )
      rt_list_checker = dispatch.MakeListChecker(rt_checker)
      checker = dispatch.PySignatureChecker([(0, rt_list_checker)])
  
      rt = ragged_factory_ops.constant([[1, 2], [3]])
  
      self.check_signatures(
          checker,
          [
              (([rt],), True),
              (([],), False),
              ((rt,), False),
              (([rt, rt + 3, rt * 2],), True),
              (([rt, rt.values, rt * 2],), False),
          ],
      )  # pyformat: disable
  
      self.assertEqual(
          repr(checker),
          "<PySignatureChecker args[0]:List[RaggedTensor]>",
      )
  
imports: import collections
  import numpy
  from tensorflow.python.framework import _pywrap_python_api_dispatcher
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 4 for calling the PythonSignatureCheckerTest obj's underlying member method code with example usage: obj.testList() without return types